[ODE] Adjusting a body's mass

[Johnson, Erik USA]

Sounds perfect!

Let's see, does that mean I have to use the dMassSetParameters() method?
Aside from dMassTranslate(), this is the only method with access to the
center of gravity position.

Thanks


> -----Original Message-----
> From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On 
> Behalf Of Geoff Carlton
> Sent: Monday, March 14, 2005 4:15 PM
> To: ode at q12.org
> Subject: Re: [ODE] Adjusting a body's mass
> 
> In addition, the distribution of weight is determined by the 
> dMass struct, since the geom shape has no affect on the 
> actual physics beyond determining the contacts.  The dMass 
> determines the inertia of the body, which can be a fairly 
> subtle effect - it will change the way the body spins in the 
> air, how it tumbles, etc.  So even if the centre of gravity 
> doesn't change, dMass will be needed to get proper results - 
> you could have all the weight in the middle, or if you have a 
> massive pair of weights at the front and the back.
> 
> Geoff
> 
> Jon Watte wrote:
> 
> >Mass translation is ignored by the body, so you have to 
> caculate what 
> >the actual center of gravity is, and put the body there 
> (typically by 
> >offsetting any geoms and joint attachment points from the body).
> >
> >A second, inferior, solution is to add a number of bodies to 
> the main 
> >body, all attached with fixed joints. This will perform 
> worse, and lead 
> >to less stability in the simulation.
> >
> >Cheers,
> >
> >			/ h+
> >
> >  
> >
> >>In my particular case, I want to add and remove "weight" in certain 
> >>places on my vehicle chassis such as a fuel tank, or a driver, or a 
> >>rocket launcher.  My hope is that I can make the vehicle 
> front or back "heavy" and it will affect the steering.
> >>    
> >>
> >
> >
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> >
> 
> 
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